Derivatives and Hedging Activities (Details Textuals) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivatives and Hedging Activities (Textuals) [Abstract]
Net reduction in interest expense on long term debt and other	$ 44.0	$ 59.0
Shares held in equity investment sold	0.0
Margin On Interest Rate Swap Not Netted	$ 173.0		$ 169.0
Derivative [Line Items]
Notional amount of long-term debt	19.9		17.7
Equity investment	49.0		49.0
Effective portion of gain (loss) on hedges	229.0	92.0
Net hedge ineffectiveness	0.0	0.0
Other Expense [Member]
Derivative [Line Items]
Gain (Loss) in Changes of Fair Value of Derivatives not designated as hedges	(17.0)	(14.0)
Gain on embedded derivatives	1.0	$ 8.0
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Derivative [Line Items]
Equity investment	0.0
Fair Value Hedges [Member]
Derivative [Line Items]
Notional amount of long-term debt	0.0		0.0
Net Investment Hedging [Member] | Other Expense [Member]
Derivative [Line Items]
Amount reclassified from AOCI into income	0.0
Net hedge ineffectiveness	0.0
Net Investment Hedging [Member] | Net Investment Hedging [Member] | Other Expense [Member]
Derivative [Line Items]
Amount reclassified from AOCI into income	0.0
Not Sold Or Repledged [Member]
Derivative [Line Items]
Securities received as collateral	$ 0.0		18.0
Risk Exposure Low [Member]
Derivative [Line Items]
Total derivative assets, net			$ 537.0